portal/database/seeders/SegmentConstantsTableSeeder.php

<?php
namespace Database\Seeders;

use App\Classes\ValueObjects\Constants\SegmentConstants;
use App\Classes\ValueObjects\Constants\WarehouseReferences;

use Illuminate\Database\Seeder;
use Illuminate\Support\Facades\DB;

class SegmentConstantsTableSeeder extends Seeder
{

    private function insertData($segment_id=1, $reference, $array_data)
    {
        DB::beginTransaction();
        DB::table('segment_constants')->insert([
            'segment_id' => $segment_id,
            'reference' => $reference,
            'value' => json_encode($array_data)
        ]);
        DB::commit();
    }

    public function run()
    {
        // insert base prices
            $n_days = 10;   // for the 10 days ahead
            $today  = date("Y-m-d");
            $prices = [];
            for($ii=0; $ii<$n_days;$ii++){
                $prices[] = [
                    "date"  => date('Y-m-d', strtotime($today. ' + '.$ii.' days')),
                    "price" => rand(10, 30) / 10
                ];
            }
            $this->insertData(1, SegmentConstants::BASE_PRICE, $prices);

        // insert state prices
            $prices = [];
            for($ii=1; $ii<=16;$ii++){
                $prices[] = [
                    'state_id'  => $ii,
                    'center'    => '10.00',
                    'outstation'=> '2.00'
                ];
            }
            $this->insertData(1, SegmentConstants::STATE_RATE, $prices);

        // insert warehouse prices
            $prices = [];
            for($ii=1; $ii<=7;$ii++){
                $prices[] = [
                    'warehouse_id'  => $ii,
                    'amount'    => '1.'.$ii
                ];
            }
            $this->insertData(1, SegmentConstants::WAREHOUSE_RATE, $prices);

        // insert center postcodes
            $prices = [
                [ 'post_code' => '80050' ],
                [ 'post_code' => '80100' ],
                [ 'post_code' => '80150' ],
                [ 'post_code' => '80200' ],
                [ 'post_code' => '80250' ],
                [ 'post_code' => '80300' ],
                [ 'post_code' => '80350' ],
                [ 'post_code' => '80400' ],
                [ 'post_code' => '80500' ],
                [ 'post_code' => '80506' ],
                [ 'post_code' => '80508' ],
                [ 'post_code' => '80516' ],
                [ 'post_code' => '80519' ],
                [ 'post_code' => '80534' ],
                [ 'post_code' => '80536' ],
                [ 'post_code' => '80542' ],
                [ 'post_code' => '80546' ],
                [ 'post_code' => '80558' ],
                [ 'post_code' => '80560' ],
                [ 'post_code' => '80564' ],
                [ 'post_code' => '80568' ],
                [ 'post_code' => '80578' ],
                [ 'post_code' => '80584' ],
                [ 'post_code' => '80586' ],
                [ 'post_code' => '80590' ],
                [ 'post_code' => '80592' ],
                [ 'post_code' => '80594' ],
                [ 'post_code' => '80596' ],
                [ 'post_code' => '80600' ],
                [ 'post_code' => '80604' ],
                [ 'post_code' => '80608' ],
                [ 'post_code' => '80620' ],
                [ 'post_code' => '80622' ],
                [ 'post_code' => '80628' ],
                [ 'post_code' => '80644' ],
                [ 'post_code' => '80648' ],
                [ 'post_code' => '80662' ],
                [ 'post_code' => '80664' ],
                [ 'post_code' => '80668' ],
                [ 'post_code' => '80670' ],
                [ 'post_code' => '80672' ],
                [ 'post_code' => '80673' ],
                [ 'post_code' => '80676' ],
                [ 'post_code' => '80700' ],
                [ 'post_code' => '80710' ],
                [ 'post_code' => '80720' ],
                [ 'post_code' => '80730' ],
                [ 'post_code' => '80900' ],
                [ 'post_code' => '80902' ],
                [ 'post_code' => '80904' ],
                [ 'post_code' => '80906' ],
                [ 'post_code' => '80908' ],
                [ 'post_code' => '80988' ],
                [ 'post_code' => '80990' ],
                [ 'post_code' => '81000' ],
                [ 'post_code' => '81100' ],
                [ 'post_code' => '81200' ],
                [ 'post_code' => '81300' ],
                [ 'post_code' => '81310' ]
            ];
            $this->insertData(1, SegmentConstants::CENTER_POSTCODE, $prices);

        // insert outstation prices
            $prices     = [
                ['post_code' => '80000' ]
            ];
            $this->insertData(1, SegmentConstants::OUTSTATION_POSTCODE, $prices);

        // insert customer prices
            $prices     = [
                ['id'=> 1, 'price' => 15 ]
            ];
            $this->insertData(2, SegmentConstants::CUSTOMER_RATE, $prices);

    }
}